1. Study Specimens B, C and D and answer questions 1(a) To 1(f). (a) i) Place two drops of specimen B on a white tile and add two drops of iodine solution. ...
Question 1 Report
1. Study Specimens B, C and D and answer questions 1(a) To 1(f).
(a) i) Place two drops of specimen B on a white tile and add two drops of iodine solution.
Complete the table below with the test, observation and inference:
| test | observation | inference |
(aii) Put 5 ml of specimen B into a test tube and add 2 ml of sodium hydroxide solution followed by three drops of copper (ii) tetraoxosulphate (VI) solution and shake Complete the table below with the test, observation and inference.
| test | observation | inference |
(b) Give the name of each of the tests in 1(a)i) and 1(a)(ii). (i) ____________ (ii) _____________
(c) State two ways by which specimen C is of economic importance.
(d)(i) Name the Kingdom to (1) (ii) which specimen C belongs. (ii) State three reasons for the. answer in 1(d)(i). (iii) Name four other organisms that belong to the same Kingdom as specimen C.
(ei) Name the Phylum to which specimen D belongs. (ii) State three reasons for the answer in 1(d)(i).
(f)(i) Explain briefly the role of specimen C in nutrient cycling. (ii) What is the mode of nutrition of specimen C.
Answer Details
(a)(i) Iodine test on specimen B (milk)
| Test | Observation | Inference |
|---|---|---|
| Two drops of specimen B on a white tile + two drops of iodine solution | The brown/yellow colour of the iodine remains unchanged | Starch is absent in specimen B |
(a)(ii) Sodium hydroxide + copper (II) tetraoxosulphate (VI) test on specimen B
| Test | Observation | Inference |
|---|---|---|
| 5 ml of B + 2 ml sodium hydroxide + three drops of copper (II) tetraoxosulphate (VI), shaken | A violet/purple colour forms | Protein is present in specimen B |
(b) Names of the tests
- (i) Iodine test (test for starch)
- (ii) Biuret test (test for protein)
(c) Two ways specimen C (mushroom) is of economic importance
- It is edible and serves as food, being a source of protein and vitamins.
- It is used in the manufacture of drugs (antibiotics) and provides a source of income and employment.
(d)(i) Kingdom to which specimen C belongs: Kingdom Fungi (Mycota).
(d)(ii) Three reasons:
- It lacks chlorophyll and so cannot photosynthesise.
- Its body is filamentous, made of hyphae forming a mycelium.
- It reproduces asexually by spores and has a chitin cell wall.
(d)(iii) Four other organisms in the same kingdom: Mucor, Rhizopus, yeast and Penicillium.
(e)(i) Phylum to which specimen D (giant land snail) belongs: Phylum Mollusca.
(e)(ii) Three reasons:
- It has a hard external shell.
- Its head bears tentacles and it has a muscular foot for locomotion.
- Its body is divided into a head, a visceral hump and a muscular foot, and it has a mantle.
(f)(i) Role of specimen C in nutrient cycling
Specimen C (mushroom) is a decomposer. Acting saprophytically on dead plant and animal matter, it breaks the material down and releases mineral nutrients back into the soil. Green plants absorb these nutrients for growth, and herbivores in turn feed on the plants, so the fungus keeps nutrients cycling through the ecosystem.
(f)(ii) Mode of nutrition of specimen C: Saprophytic (heterotrophic) nutrition.
Download The App On Google Playstore
Everything you need to excel in your exams
